【发布时间】：2021-11-19 19:14:40
【问题描述】：
我正在开发一个带有颤振和带有rest api的mysql的应用程序。我必须页单元和章节。当我更新章节的任何信息时，它不会显示在列表视图的单元页面中。如何重新加载列表视图？我的代码：
对于 staffunit.dart
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:intl/intl.dart';
import 'package:studyplanner/helper/get_helper.dart';
import 'package:studyplanner/widgets/teacher/staff_unit_tile.dart';
class Staffunit extends StatefulWidget {
final String iClassid;
final String iSubjid;
final String iStaffid;
final String iPaperid;
final String paper;
final String maxdateunit;
final String cClass;
Staffunit({
this.iClassid,
this.iSubjid,
this.iStaffid,
this.iPaperid,
this.paper,
this.maxdateunit,
this.cClass,
});
@override
_StaffunitState createState() => _StaffunitState();
}
class _StaffunitState extends State<Staffunit> {
var Staffunit;
@override
void initState() {
Staffunit = GetHelper.getData4(
widget.iClassid,
widget.iSubjid,
widget.iStaffid,
widget.iPaperid,
'get_staff_unit',
'iClassid',
'iSubjid',
'iStaffid',
'iPaperid');
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: (AppBar(
iconTheme: IconThemeData(
color: Colors.white,
),
title: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
widget.cClass,
style: TextStyle(fontSize: 18, color: Colors.white),
),
Text(
widget.paper,
style: TextStyle(color: Colors.black, fontSize: 10),
),
Text(
widget.maxdateunit != null
? "Last Updated on : " +
DateFormat('dd-MM-yyyy')
.format(DateTime.parse(widget.maxdateunit))
: "",
style: TextStyle(color: Colors.black, fontSize: 12),
)
],
),
elevation: 0.0,
bottomOpacity: 0.0,
actions: <Widget>[
Padding(
padding: EdgeInsets.only(right: 20.0),
child: GestureDetector(
onTap: () {
Navigator.of(context).pushNamed(MainTeacherPage.routeName);
},
child: Icon(
Icons.home,
size: 26.0,
),
),
),
],
)),
body: Container(
width: double.infinity,
decoration: BoxDecoration(
gradient: LinearGradient(begin: Alignment.topCenter, colors: [
Color.fromRGBO(51, 169, 214, 1),
Color.fromRGBO(255, 255, 255, 1),
])),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Expanded(
child: Container(
width: double.infinity,
decoration: BoxDecoration(
color: Colors.white,
borderRadius:
BorderRadius.only(topRight: Radius.circular(100))),
padding: EdgeInsets.all(20),
// we will use future builder to show the data in a list view
// we put the future variable
// check if there is no show a message to user no data
// else show a list view with tiles that show our data
child: FutureBuilder(
future: Staffunit,
builder: (context, snapshots) {
// print(widget.iPaperid);
// print(snapshots.toString());
if (!snapshots.hasData || snapshots.data.length == 0) {
return Center(
child: Text(
'No Unit Available',
style: TextStyle(
color: Colors.black,
fontWeight: FontWeight.bold,
fontSize: 30,
),
),
);
}
return ListView.builder(
itemCount: snapshots.data.length,
itemBuilder: (context, index) {
return Staffunittile(
id: snapshots.data[index]['id'],
unit: snapshots.data[index]['cDesc'],
per: snapshots.data[index]['per'],
Alloted: snapshots.data[index]['Alloted'],
Completed: snapshots.data[index]['Completed'],
iClassid: widget.iClassid,
iSubjid: widget.iSubjid,
iStaffid: widget.iStaffid,
iPaperid: widget.iPaperid,
cClass: widget.cClass,
cIcon: snapshots.data[index]['cIcon'],
);
},
);
},
)),
),
],
),
),
);
}
}
对于 Staffunittile.dart
import 'package:flutter/material.dart';
import 'package:studyplanner/screens/teacher/staffchapter.dart';
import 'package:studyplanner/global_var.dart' as global_var;
class Staffunittile extends StatelessWidget {
final String id;
final String unit;
final String per;
final String iClassid;
final String iSubjid;
final String iStaffid;
final String iPaperid;
final String Alloted;
final String Completed;
final String maxdatechapter;
final String cClass;
final String cIcon;
Staffunittile({
this.id = "",
this.unit = "",
this.per = "",
this.iClassid = "",
this.iSubjid = "",
this.iStaffid = "",
this.iPaperid = "",
this.Alloted = "",
this.Completed = "",
this.maxdatechapter,
this.cClass,
this.cIcon = "",
});
@override
Widget build(BuildContext context) {
return Column(
children: <Widget>[
Container(
decoration: BoxDecoration(
border: Border(
bottom: BorderSide(color: Colors.lightBlue.shade900),
),
),
child: ListTile(
leading: SizedBox(
child: Image.network(
global_var.logoimageurl + cIcon,
fit: BoxFit.scaleDown,
),
width: 60,
),
// isThreeLine: true,
title: Text(
unit,
style: TextStyle(
color: Colors.black,
fontWeight: FontWeight.bold,
fontSize: 15,
),
),
subtitle: Text(
"Completed : " + Completed + "/" + Alloted + " (" + per + " %)",
style: TextStyle(
color: Colors.blueAccent,
fontSize: 15,
),
),
trailing: Icon(
Icons.keyboard_arrow_right,
color: Colors.red,
),
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => Staffchapter(
iStaffid: iStaffid,
iClassid: this.iClassid,
iSubjid: this.iSubjid,
iPaperid: this.iPaperid,
iUnitid: this.id,
unit: unit,
cClass: cClass,
)),
);
},
),
),
// Divider(
// thickness: 0.5,
// )
],
);
}
}
对于staffchapter.dart
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:studyplanner/helper/get_helper.dart';
import 'package:studyplanner/widgets/teacher/staff_chapter_tile.dart';
import 'package:studyplanner/screens/teacher/main_teacher_page.dart';
class Staffchapter extends StatefulWidget {
final String iClassid;
final String iSubjid;
final String iStaffid;
final String iPaperid;
final String iUnitid;
final String unit;
final String cClass;
final String chapterid;
Staffchapter({
this.iClassid,
this.iSubjid,
this.iStaffid,
this.iPaperid,
this.iUnitid,
this.unit,
this.cClass,
this.chapterid,
});
@override
_StaffchapterState createState() => _StaffchapterState();
}
class _StaffchapterState extends State<Staffchapter> {
var Staffchapter;
@override
void initState() {
fetchdatach();
super.initState();
}
fetchdatach() {
Staffchapter = GetHelper.getData5(
widget.iClassid,
widget.iSubjid,
widget.iStaffid,
widget.iPaperid,
widget.iUnitid,
'get_staff_chapter',
'iClassid',
'iSubjid',
'iStaffid',
'iPaperid',
'iUnitid',
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: (AppBar(
iconTheme: IconThemeData(
color: Colors.white,
),
title: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
widget.cClass,
style: TextStyle(fontSize: 18, color: Colors.white),
),
Text(
widget.unit,
style: TextStyle(color: Colors.black, fontSize: 10),
),
],
),
elevation: 0.0,
bottomOpacity: 0.0,
actions: <Widget>[
Padding(
padding: EdgeInsets.only(right: 20.0),
child: GestureDetector(
onTap: () {
// Staffchapter.dispose();
Navigator.pop(context);
},
child: Icon(
Icons.home,
size: 26.0,
),
),
),
],
)),
body: Container(
width: double.infinity,
decoration: BoxDecoration(
gradient: LinearGradient(begin: Alignment.topCenter, colors: [
Color.fromRGBO(51, 169, 214, 1),
Color.fromRGBO(255, 255, 255, 1),
])),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Expanded(
child: Container(
width: double.infinity,
decoration: BoxDecoration(
color: Colors.white,
borderRadius:
BorderRadius.only(topRight: Radius.circular(100))),
padding: EdgeInsets.all(20),
// we will use future builder to show the data in a list view
// we put the future variable
// check if there is no show a message to user no data
// else show a list view with tiles that show our data
child: FutureBuilder(
future: Staffchapter,
builder: (context, snapshots) {
// print(widget.iUnitid);
// print(snapshots.toString());
if (!snapshots.hasData || snapshots.data.length == 0) {
return Center(
child: Text(
'No Chapter Available',
style: TextStyle(
color: Colors.black,
fontWeight: FontWeight.bold,
fontSize: 30,
),
),
);
}
return ListView.builder(
itemCount: snapshots.data.length,
itemBuilder: (context, index) {
// print(widget.iPaperid);
return Staffchaptertile(
id: snapshots.data[index]['id'],
ron: snapshots.data[index]['ron'],
chapter: snapshots.data[index]['cDesc'],
per: snapshots.data[index]['per'],
dUpdate: snapshots.data[index]['dUpdate'],
chapterid: snapshots.data[index]['chapterid'],
iClassid: widget.iClassid,
iSubjid: widget.iSubjid,
iPaperid: widget.iPaperid,
iUnitid: widget.iUnitid,
cClass: widget.cClass,
);
},
);
},
)),
),
],
),
),
);
}
}
对于员工章节
import 'package:flutter/material.dart';
import 'package:studyplanner/helper/get_helper.dart';
import 'package:intl/intl.dart';
class Staffchaptertile extends StatelessWidget {
final String id;
final String chapter;
final String per;
final String iClassid;
final String iSubjid;
final String iPaperid;
final String iUnitid;
final String ron;
final String dUpdate;
final String cClass;
final String chapterid;
Staffchaptertile({
this.id = "",
this.chapter = "",
this.per = "",
this.iClassid = "",
this.iSubjid = "",
this.iPaperid = "",
this.iUnitid = "",
this.ron = "",
this.dUpdate = "",
this.cClass = "",
this.chapterid = "",
});
@override
Widget build(BuildContext context) {
return Column(
children: <Widget>[
ListTile(
// isThreeLine: true,
title: Text(
ron.toString() + "." + chapter,
style: TextStyle(
color: Colors.black,
fontSize: 15,
),
),
subtitle: Text(
dUpdate != ""
? "\n(" +
DateFormat('dd-MM-yyyy').format(DateTime.parse(dUpdate)) +
" )\n"
: dUpdate,
style: TextStyle(
color: Colors.blueAccent,
fontSize: 15,
),
),
trailing: Icon(
per.toString() == "100"
? Icons.check_box_outlined
: Icons.check_box_outline_blank,
color: Colors.red,
),
onTap: () {
if (this.dUpdate == "") {
print(this.chapterid);
GetHelper.askYseNo(
context,
"Mark as COMPLETED?",
1,
int.parse(this.chapterid),
);
}
},
),
Divider(
thickness: 1.5,
)
],
);
}
}
如何刷新单位列表？
【问题讨论】：